Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two engine ground screws. Refer to "GROUND INSPECTION ".
OK or NG
1. OK : GO TO 2.
2. NG : Repair or replace ground connections.
  
  Fig 1: Checking Engine Ground Connections
  Courtesy of NISSAN MOTOR CO., U.S.A.
RETIGHTEN HEATED OXYGEN SENSOR 1
Loosen and retighten corresponding heated oxygen sensor 1.

Fig 2: Identifying Heated Oxygen Sensor
Courtesy of NISSAN MOTOR CO., U.S.A.

Tightening torque: 40 - 50 N.m (4.1 - 5.1 kg-m, 30 - 37 ft-lb)
1. : GO TO 3.
CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-II.
3. Clear the self-learning control coefficient by touching "CLEAR".
4. Run engine for at least 10 minutes at idle speed.
  Is the 1st trip DTC P0171 detected?
  
  Is it difficult to start engine?
  
  Fig 3: CONSULT-II Diagnosis Function Display
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed.
4. Stop engine and reconnect mass air flow sensor harness connector.
5. Make sure DTC P0102 is displayed.
6. Erase the DTC memory. Refer to "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION ".
7. Make sure DTC P0000 is displayed.
8. Run engine for at least 10 minutes at idle speed.
  Is the 1st trip DTC P0171 detected?
  
  Is it difficult to start engine?
  
  Fig 4: Identifying Mass Air Flow Sensor
  Courtesy of NISSAN MOTOR CO., U.S.A.
Yes or No
1. Yes : Perform trouble diagnosis for DTC P0171. Refer to DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION .
2. No : GO TO 4.
CHECK HEATED OXYGEN SENSOR 1 HEATER
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK : GO TO 5.
2. NG : Replace malfunctioning heated oxygen sensor 1.
CHECK HEATED OXYGEN SENSOR 1
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK : GO TO 6.
2. NG : Replace malfunctioning heated oxygen sensor 1.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT " For circuit, refer to "WIRING DIAGRAM ".
1. : INSPECTION END